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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Insight into Out-of-Layer Fluctuations in the Smectic A Stability of 3,5-Diarylisoxazole Liquid Crystals
Eric S Sales1, Gabriel M Dos Santos1, Richard J Mandle2,3
1Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, 91501970, RS, Brazil.
Summary
Synthesized polar-terminated 3,5-diarylisoxazole liquid crystals (ILCs) exhibit diverse mesophases. Molecular structure influences liquid crystal properties, including out-of-layer fluctuations and translational order, revealing insights into material behavior.
Area of Science:
- Materials Science
- Organic Chemistry
- Condensed Matter Physics
Background:
- Liquid crystals (LCs) are states of matter with properties between conventional liquids and solid crystals.
- Polar-terminated 3,5-diarylisoxazole liquid crystals (ILCs) offer tunable properties due to their rigid core and flexible spacers.
- Understanding structure-property relationships in ILCs is crucial for advanced material applications.
Purpose of the Study:
- To synthesize and characterize novel polar-terminated 3,5-diarylisoxazole liquid crystals.
- To investigate the influence of terminal groups and alkyl chain structure on mesophase behavior.
- To analyze out-of-layer fluctuations (OLFs) and their relationship with molecular structure and order.
Main Methods:
- Synthesis of various hydroxyl-, ketal-, 1,2-diol-, and bromine-terminated ILCs.
- Characterization using X-ray diffraction and optical microscopy to identify mesophases and textures.
- Analysis of out-of-layer fluctuations (OLFs) and smectic translational order parameter (TOP) Σ.
Main Results:
- Hydroxyl-, ketal-, and 1,2-diol-terminated ILCs displayed smectic C and A mesophases.
- Bromine-terminated ILCs exhibited smectic A and B mesophases.
- OLFs were correlated with bromine atom hardness, hydrogen bonding, and conformational effects; 1,2-diol-terminated ILCs showed two SmC sublayers.
Conclusions:
- The molecular design of polar-terminated 3,5-diarylisoxazole ILCs dictates their mesophase behavior and physical properties.
- Out-of-layer fluctuations are significantly influenced by terminal group polarity and molecular architecture.
- Intramolecular hydrogen bonding in 1,2-diol-terminated ILCs leads to unique sublayer structures.
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